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極低炭素フェライト系ステンレス鋼の特性

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川崎製鉄技報 KAWASAKI STEEL GIHO

Vol.9 (1977) No.1.2

極低炭素フェライト系ステンレス鋼の特性

Properties of Ultra Low Carbon Ferritic Stainless Steels

大橋 延夫(Nobuo Ohashi) 小野 寛(Yutaka Ono) 増尾 誠(Makoto Masuo) 竹 田 元彦(Motohiko Takeda) 西山 昇(Noboru Nishiyama)

要旨 : 真空脱炭吹錬で極低炭素化した新鋼種リバーライトシリーズの各種鋼について,その特性 や技術的基盤の一端を紹介した。10~13%Cr 鋼としては,R410L(C≦0.030%)や R410UL(C ≦0.010%)が溶接性と耐酸化性に優れ,低C高 Si の Ti 添加 12%Cr 鋼の R409SR は,950℃ 以下の範囲で断続加熱される自動車排ガス浄化装置などに適する。16~18%Cr 鋼としては R430UL と Ti 添加 R430LT があり,溶接部の耐銹性と靱性が優れている。R430LT はまた プレス成形性や耐酸化性にも優れている。Mo 含有 17~19%Cr 鋼としては Ti 添加の R434LT-1(-2)や Nb 添加の R434LN-1(-2)が孔食,隙間腐食や応力腐食割れの恐れのある強 腐食環境に適し,特に,-2 で示される 2%Mo 鋼は,CI-イオンを含む水溶液中でオーステ ナイト系AISI 316 鋼と同等の優れたアノード分極特性を示す。 Synopsis :

Properties and fundamental technical data are introduced on new RIVER LITE series ferritic stainless steels decarburized in a vacuum oxygen degasser. In an 11-13%Cr grade, R 410L(C≦0.03%) and R 410UL (C≦0.01%) steels ensure good weldability and antioxidation property, and R 409SR (low C, high Si and Ti-bearing 12%Cr) steel withstands cyclic heating at elevated temperatures up to 950℃ as in an automobile exhaust gas clean-up system. In a plain 16-18%Cr grade, R 430UL and Ti-bearing R 430LT steels exhibit good antirusting and toughness properties even at weld parts. R 430LT steel also has superior press-formability and antioxidation property. In a Mo-containing 17-19%Cr grade, R 434LT-1(1%Mo) and -2(2%Mo) and Nb-bearing R 434LN-1(1%Mo) and -2(2%Mo) steels can be used in highly corrosive environments where there are possibilities of pit or crevice corrosion and stress corrosion cracking. Especially, the 2%Mo steels show as good anodic polarization characteristics as does austenitic AISI-316 steel in C1^ ion-containing aqueous solutions.

(c)JFE Steel Corporation, 2003

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